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(No flodel.)

, H. W. PAGE & GARLEY.

ELEGITRIG ALARM FOR STEAM BO LERS, m.

. No. 290,101. Patented Decrll, 1-883.

WITNES I rfi'w y/ ATTORNEYS.

N. FETERS Ha'oLMognpbeq Waihingion. o. (L

UNITED STATES PATENT "OFFICE HARRYVWOODBURN PAGE AND HARVEY oARLEY, OFLone BRANCH, NEW JERSEY; sAID oARLEY ASSIGNOR OF ONE-HALF HIS RIGHT roTHOMAS MOKENNA, OF s ME PLACE.

ELECTRIC ALARM FOR STEAM -B OILERS, 80C.

. I SPECIFICATION forming part of Letters Patent No. 290,101, datedDecember 11, 1883.

Application filed March 24, 1883. (No model.)

To aZZ whom it may concern: with reference to the degree-marks 'on theBe it known that we, HARRY W. PAGE and plate G. 5 HARVEY OARLEY, both ofLong Branch, in H J represent, respectively, the connected the county ofMonmouth and State of New electric alarm and battery, which areconnect-' Jersey, have invented a new and Improved ed, respectively, tothe bent rods E and the Electric Alarm for Steam-Boilers, 850., ofmercury-tube d by the wires h and j.

t which the following is a full, clear, and exact The action of thedevice is as follows: 'When description. A the water in the boilerstands above the low- The object of our invention is to provide an waterline, the water entering the chamber 1) IO electricalarm apparatus moreespecially inthrough the stem D will prevent the entrance tended for useas a low-water indicator for of steam to the said chamber, and themercury steam-boilers, in which apparatus mercury is in the bulb a willhave the same temperature 6c used for completing the electric circuitwhen as the water, causing it to stand in the tube d the alarm should begiven. The apparatus is somewhat below the lower end of the arm 6,-

1 also applicable to ovens, furnaces, and other but when the water inthe boiler falls below contrivances where the heat within hasneed thelow-water line. the steam in the boiler to be regulated. l/Vhen appliedto steam-b'oilwill enter the chamber 1), and, being of amuch ers, theaction of theapparatus depends upon higher temperature than the water,will cause the fact that the steam in the boiler is always the mercuryto rise in the tube d in contact 2Q of a higher temperature than thewater. a with the lower end of the arm e, (the rod E Reference is to behad to the accompanying having been previously properly adjusted,)drawing, forming part of this specification, in and thus complete theelectric circuit and 0 which the figure is a sectional elevation of ourcause the alarm to be given. invention as it appears when applied to aIn the spindle D is fitted the screw-plug k,

25 steam-boiler. c for cutting off communication between the Arepresentsathermometerlik'e device, the chamber 72 andv boiler O, in case itshould be mercury-bulb a of which is inclosed in the. desired to unscrewthe bulb B from the tube 7 sectional globe B, which forms the chamber bD, or to. unscrew the upper section, b, from around the mercury-bulb, asshown. This the lower section, If, of the bulb for repairs;

3o chamber b communicates with the interior of and to adapt the spindleD to serve also as a the boiler Othrough the valve-stem D, to whichtest-cock,- we provide it with the faucet-sleeve Z the globe B isattached, and which stem is and plug Z, as shown clearly in the drawing.screwed into a suitable screw-tap made in the The mercury-tube cZ-isenlarged upon the inboiler at the low-water line. side at a point abovethe lower end of the arm 3 5 In the-plate F, which closes the upper ende, asshown at d, to prevent all danger of i of the tube (Z of thethermometer-like device overflow of the mercury in case of excessive A,is fitted the thumb-nut f, through which heat. passes the insulated arme-of the bent rod E; Constructed in this manner, the alarm deand theinsulating material a on said arm 6 is vice is reliable and cheap, andby adjusting 4o screw threaded to match the screw-threads of the rod 1]it may be applied to avariety of the nut f, so that by turning the saidnut f uses. the bent rod E may be raised or lowered to Having thusdescribed our invention, what 0 suit the temperature at which it isdesired to we claim as new, and desire to secure by Letters have thealarm given. The arm 6' of the bent Patent, is

4 5 rod E is of the same length as the arm 6, and 1. The combination,with the boiler 0, proreaches down in front of the graduated plate widedwith the tube D, of the globe B, inclosvilli G, attached to thethermometer-tube d, and ing the water and steam chamber 12, mercury- 5thus serves as an indicator for setting the rod E bulb a, provided withmercury-tube cl, ad-

3. In an electric alarm, the colnbination, with the globe B, of themercury-tube a, suspended within said globe, the tube d, )r0vid ed withthe thumb-nut f, and the insulated threaded wire 0 a, substantially asherein shown and described.

HARRY \VOODBURN PAGE. HARVEY OAKLEY.

\Vitnesses:

SYDNEY T. SLocUM, \VILLLuI W. WEsT.

